3.1.3 Twisted Pair Cable Facts
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Questions and Answers

What is a key benefit of twisting the wire pairs in twisted pair cabling?

  • To increase the length of the cable
  • To enhance the aesthetic appeal
  • To physically strengthen the wires
  • To reduce electromagnetic interference (correct)

    • Which type of twisted pair cable is less expensive and easier to work with?

  • Fiber optic cable
  • Unshielded twisted pair (UTP) (correct)
  • Shielded twisted pair (STP)
  • Coaxial cable

    • What is one disadvantage of twisted pair cables?

  • They have very high bandwidth
  • They are susceptible to interference (correct)
  • They are more durable than coaxial cables
  • They are resistant to eavesdropping

    • What is the main difference between shielded twisted pair (STP) and unshielded twisted pair (UTP)?

    <p>STP offers better EMI protection (B)</p> Signup and view all the answers

    What is the maximum speed supported by Cat 5 twisted pair cable?

    <p>100 Mbps (B)</p> Signup and view all the answers

    Which of the following wiring standards is NOT commonly used in twisted pair cabling?

    <p>RJ11 (B)</p> Signup and view all the answers

    What is a characteristic of higher numbered twisted pair cable categories?

    <p>They allow for faster transmission speeds (C)</p> Signup and view all the answers

    What type of connector does Cat 5 twisted pair cable typically use?

    <p>RJ45 (D)</p> Signup and view all the answers

    Which category of UTP cable supports gigabit Ethernet and is similar to Cat 5 but provides better EMI protection?

    <p>Cat 5e (C)</p> Signup and view all the answers

    What is the maximum length for Cat 6 cables to maintain a 10 Gbps speed?

    <p>55 meters (D)</p> Signup and view all the answers

    Which category of cable offers exceptional noise immunity and has the strictest specifications for crosstalk and noise?

    <p>Cat 7 (B)</p> Signup and view all the answers

    Which type of twisted pair cable is designed for direct burial in the ground?

    <p>Direct burial rated (B)</p> Signup and view all the answers

    Which cable type is suitable for use where flexibility and frequent movement are needed?

    <p>Stranded core (B)</p> Signup and view all the answers

    Which category of cable is rated for data transfers 400 times faster than Cat 5?

    <p>Cat 8.2 (B)</p> Signup and view all the answers

    What type of cable meets rigorous fire safety standards for installation in plenum spaces?

    <p>Plenum rated (C)</p> Signup and view all the answers

    Which cable category is limited to connecting devices less than 100 meters apart for optimal 10 Gbps performance?

    <p>Cat 6a (B)</p> Signup and view all the answers

    Flashcards

    Twisted Pair Cable Components

    Twisted pair cables consist of four pairs of copper wires, each pair twisted together. Each wire transmits a signal (positive or negative), and the twisting reduces interference. PVC insulation covers each wire, and an outer sheath protects the entire bundle.

    Twisted Pair Cable Interference Reduction

    Twisting the wires in pairs minimizes electromagnetic interference (EMI) and crosstalk.

    UTP vs. STP

    Unshielded Twisted Pair (UTP) cable has only an outer plastic sheath; Shielded Twisted Pair (STP) has a grounded copper shield around the wires. STP offers better EMI protection but is more expensive than UTP.

    T568A/T568B

    Wiring standards (T568A and T568B) specify the order of wires in RJ45 connectors.

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    Twisted Pair Cable Advantages

    Twisted pair cable is inexpensive, easy to install, and commonly used. Tools and materials are readily available.

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    Twisted Pair Cable Disadvantages

    Twisted pair cable is susceptible to interference, damage, and eavesdropping. It also has lower bandwidth compared to some other options.

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    Twisted Pair Cable Categories

    UTP cable categories (e.g., Cat5) differ in their speed, frequency, and wire design. Higher categories support faster data rates.

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    Category 5 (Cat5) Cable

    Cat5 cable in the RJ45 connector can support 100 Mbps Ethernet. Used for faster network speeds compared to older categories.

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    Cat 5e UTP Cable

    A type of twisted-pair cable providing better EMI protection than Cat 5 , supports Gigabit Ethernet, and uses RJ45 connectors.

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    Cat 6 UTP Cable

    Twisted-pair cable, supports 10 Gbps speeds but has length limitations (< 55m) and uses RJ45 connectors.

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    Cat 6a UTP Cable

    Twisted-pair cable designed for 10 Gbps speeds, with longer cable length support (< 100m), and added shielding for better performance, uses RJ45 connectors.

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    Plenum Cable

    A type of cable designed for use in plenum spaces (areas used for air circulation) and must meet strict fire safety standards (no toxic fumes).

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    Direct Burial Cable

    Cable designed for direct burial in the ground. Does not need any additional protection, and is very sturdy in outdoor environments.

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    General Purpose UTP Cable

    A type of cable having the minimum requirements for commercial installations. Used for network patch cables.

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    UTP Cable Substitution

    You can utilize a higher category cable in place of lower ones, but never substitute a lower for a higher.

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    RJ45 Connector

    A standard connector used for connecting twisted-pair cables, such as Cat5, Cat6, Cat7 cables, and more.

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    Study Notes

    Twisted Pair Cable Overview

    • Twisted pair cabling reduces signal interference and supports modern network standards.
    • Composed of copper wires twisted in pairs, insulated with PVC, and bundled in an outer sheath.
    • Unshielded twisted pair (UTP) is less expensive and easier to work with.
    • Shielded twisted pair (STP) offers better EMI protection but is more expensive.
    • T568A and T568B are wiring standards defining RJ45 connector wire order.

    Twisted Pair Cable Comparison

    • Advantages: Inexpensive, easy installation, flexible, lightweight, common medium.
    • Disadvantages: Susceptible to interference, damage, and eavesdropping; low bandwidth.

    Twisted Pair Cable Categories

    • Cable categories differ electrically, not physically. Higher categories support faster speeds due to different wire gauges and twists per inch.
    • Phone cable (RJ11): Two pairs (4 wires), used for dial-up.
    • Cat 5: Supports 100 Mbps Ethernet, uses RJ45.
    • Cat 5e: Improved EMI protection, supports Gigabit Ethernet, uses RJ45.
    • Cat 6: Supports 10 Gbps (limited to 55m), uses RJ45.
    • Cat 6a: Supports 10 Gbps (limited to 100m), improved shielding, uses RJ45.
    • Cat 7: Supports 10 Gbps, shielded, strictest crosstalk specs, uses RJ45.
    • Cat 7a: Supports 10 Gbps, shielded, exceptional noise immunity, strictest crosstalk specs, uses RJ45.
    • Cat 8.1: Supports 25 Gbps, shielded, uses RJ45 for Class I, non-RJ45 for Class II.
    • Cat 8.2: Supports 40 Gbps, shielded, uses RJ45 for Class I, non-RJ45 for Class II.
    • Use a special crimping tool for connectors.
    • Substitution rule: Cat X can be substituted for any category below X, but not above it.
    • Cable cores: Solid core for long runs, stranded core for flexible drop cables.

    Twisted Pair Cable Ratings

    • Direct Burial: Designed for direct burial in the ground; no extra protection needed.
    • General: Minimum requirement for commercial installations, meets UL-1518, and vertical flame test standards. High toxicity during burning.
    • Plenum: Used in plenum spaces (air circulation areas). Flame retardant, non-toxic plastics, meets NFPA-262 and 90A standards.
    • Riser: Used in vertical shafts between floors; withstands fire propagation, UL-1666 tested. Tested while mounted vertically.

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    Description

    Explore the fundamental aspects of twisted pair cables in this quiz. Learn about the differences between unshielded and shielded twisted pair cables, their advantages and disadvantages, and the various cable categories. Understand wiring standards and how they impact modern networking.

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